Sound recording and reproducing device



Nov. 24,1925. 1,563,033

A. JUNOD SOUND RECORDING AND REPRODUCING DEVICE Filed Oct. 5, 1921 55 INVENTOR ATTORNEY asta Nev. 24, 1925. V

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implication filedQcteberfi, 1921 Serial No. 504,987

Zen of the United States, and a resident of the borough of 1 Manhattan, city of -,New,

York, in the county of New York and IState of New York, have invented certain new and thereof,-is amplified in volume and useful Improvements in a Sound Recordingand Reproducing Device, of which'the 'fOlr lowing is a specification. I Th's lnventlon relates to an m roved sound recording and reproducing evice.

Its object is the roductionof afdevice which with at sing e stylus is adapted-to actuate with the vibrations. of'a pair ofthe usual diaphra ms of a sound recording tie.

vice, orthe diaphragms of a sound reproducer are caused to vibrate with'the'oscilladone of the stylus. The functions are performed-with the samestylus'.whether the record to be made or the one usedis pro-'v vided-withrvertical' undulations, that to say, vertical cuts or with lateral undulations that is to say lateral cuts.

Another object ofthe invention is the prodlict-ion of a device .by means of which vthe sound emanating from the tru pet I th e'dis tinctness of the tone improveoh. A specific object of the invention -lsfto.

d make the. stylus thereof to swingin either Vertical or horizontal planes. X 1

The organization of the "invention comprisesa pair of 'diaph'ragmsfof 'acpair of sound boxes, that will be effective 'when' at right. angles to the diaphragms 23 and 24. In theupper portion'36 of the late A;

aring both vibrate in the same direction or when the direction of vibrations of one is opposite to the'other. The stylus is supported so that when coacting with a vertical cut record it causes the diaphragms to simultaneously vi-' brate' in the, same direction, that is to say, they simultaneously move in and then both move out, the efl'ect of one being added to the other. When the styluscoacts with a lateral cut record, one diaphragm moves out while the other one is moving in, and their combined effect is a summation of both.

Transverse arms extend from the support of the stylus and have 'their'outerends connected to a pair of diaphragms, by means, of which the movements of the stylus are com munic'ated to bo h. r

j The inventio isfnrther} characterized by the fact that the device. functions for either-' vertically cut or latrallyicut soundrecords the said diaphragms simultaneously '37 is formed, the similar vertically dlsgosed at: B

improved sound recording and reproducing device; Fig. 2 shows atop-plan view of Fig. .1 and sectionfof Figs 1 on the line 2, 2;

Fig. 3 is a section of g. 1 on theline 3,23;

Fig. 1 represents a' front elevation of. the

'. without' any 'adj us tment' or chafigexof its parts. I

Fig. 4 indicates a section of Fig. 1, on the hne 4, 4 with-a portion thereof in'full lines; F g. 5 shows a. section of Fig. 1 on the line some modified details and Fig; 8 shows a" section of Fig.7 on the line 8,8.

ofjsound boxes vand 21 are respectively indicated with the diaphragms 23 and 24;-

A tone arm 25'hasformed therewith the Referring to Figs. 1 to 4 inclusive a pai'r'} 05' 5, -5"; Eig. 6 indicates'a section of Fig. 2 on c the line 6, 6; Fig. 7 represents a side view of 32 connectsfthe said sound boxes and .has

extending therefrom the therein bearings 39 with suflicient clearance to enable the, plate A to oscillate ina' plane is formed the vertically disposed 40'similar 1:039, and in-the curi'red portion bearing 41.. A stylus supporting hrac is indicated with the vertical arms .46'and Thefarm 46 has extendin pair of horizontally. disposed knife edge pro e'aetions33. A supporting'and oscillating plate. A is indicated with. the upwardly incl ned arms 35-which' join at their up er ends to. formthe u per portion 36 and t eirflower'ends joinfto orm the curved portion 37. Lateral portions 38 .47, the third arm 48 and the fourth arm 49:

therefrom the vertically disposed knife e geprojection "5'0 V and the arm 47 has extending therefrom the similar projection 51. The projection 50 is seated in the bearing-40 and the projection 5l'is seatdin the bearing 41. The spaces between the bear-in s 40, 41' andetlge-projections 50, 5-1 are sucie'nt to enable the supporting bracket B to oscillate to" and fro to planes ,inclined to thef'plane' of the diaphragms 23 and 24:. The end .612 the-arm 48 is spaced from a vertical planeextending through the projections'BQ andfiI-Ftqlocate' the stylus 64, to be describedfatasufiolehtl} distance from the diaphragms 23' and 24 to the fourth arm 49, and preferably a little below the plane of ihe projections 33 and to the rear of the plane of the diaphragms 23and 24. g

The axis of oscillation of therertical projections 50 and 51 and the axis of oscillations of the projections 33 are substantially equally distant from the centers of the diaphragins and 24. Transverse arms Q3 and 54 extend from the bracket B and have their outer ends respectively fastened to the diaphragms 23 and 24. The said arms are maintained in tension by their coaction with the said diaphragms 23 and24 when the latter are performing their function.

A U shaped bracket 55 extends from the rear face of the frame 32 and has extending therethrough the tension arm 0 with the hook end 56 and the threaded end 57L An adjusting nut 58 is in threaded engagement with the threaded end 5? and the hook end 5d bears against the'point 52 of the screw 52. The function of the tension arm C is to preferably maintain the -point52 of'the screw 52 to the rear of the plane of diaphragms 23 and 24., When the bracket 13 is maintained in operative position with its projections 50 and 51 they are seated in their respective bearings 40 and 41 and the projections 38 are seated in their bearings 39. By virtue of the contact between the point 52 and the-hookend 56 being tothe rear of the bearings ofgthe bracket B, a pulling effect is produced to properly tension the said bracket on its bearings.

The arm 48 {has connected thereto a support 63 for the stylus 64. f

To use the device as a sound reproducer and referring to Figs. 1 and 4 inclusive the stylus 64,is engaged with the' sound record groove of a record disc R, which rotates with the usual turntable 140 of a talking machine. If the sound record groove is of the vertical type with up and down cuts; the

stylus 64 has imparted thereto vertical oscillaflons. connnunicates lts movements to" the support ing and oscillating plate A,,which latter oscillates on the bearings 39. These-oscillations are transmitted to the transverse-arms 53 and 54, and thereby the diaphragms 23 and 24 are simultaneously vibrated in the same direction. The vibrations of the diaphragms produce soiind waves which flow 6 through the branch tone arms 27 and finally.

. vibrated.

The stylus supporting bracket l5 throughthe tone arm 25, to the horn er v i i 32. I By means of the tensional relations of the said platev A, the bracketB andthe frame 32, the diaphragms, will be maintained in a neutral position without any strains when not'vibratijng. Assoon as the diaphragnis 23, 24 arevibrated' by the coaction of the stylus 64 and the sound groove i sound record through the intervention of the stylus (54 andits coacting elements releases the strain on the diaphragnis, the

stored energy of the parts in tcusioual relation referred to assists in moving the diaphragms back'to their initial neutral posh tions. The stylus G4 is Inaintained in balance by reason ofthe interposed connections between it and the two .diaphragms 23 and 24. c a

It. will he noted that if no tensional rein tion existed between the plate A, thebracket B- and the frame'32 the weight of the sound boxes2O and 21 and their related elements would force down the bracket- B with its ing of the elements A, B and the frame 82 compensate this tendency and maintains ill) related elements toward the record disc R, p

the diaphragms in their normal and neutral position. I

In case a record disc with lateral undulations is used in place of the disc R, the bracket B will be oscillated on the vertical bearings 40, 41, and the transverse .arms 53,

54 will be alternately oscillated, by means of which the 'diaphragrns will be alternately Thatis to say, when one diaphragm is moving inwardly the other one is moving outwardly.

. Referring to Figs.;7 and 8 the invention is modified by substituting for the bracket B the ringtitn' which latter has formed therewith the bifurcated projection 67, that is detachably fastened to the transverse arms 53 and 54. A fulcrum pin 68'extends from the upper portion of the inner face of the ring 66. A screw 69 with the bearing point .70 is in threaded engagement with the lower portion of the. ring 66. A pair of fulcrum pins 72 extend from the. frame 32 and support the central. portion 73, which in turn engages the pin '68 and the point 70 "of the screw 69. Au arm it-extends from the ring 66,.a'nd a stylus support 76 for the stylus 77'extends from the arm 75.

54 will impart to the diaphragms 23 and 24 to the diaphragm vibrationsin-opposite di- 3 atoaoea v w simultaneous vibrations in the same direction. When using a lateral cut record the ring 66 willoscillate on the pin fi8'andrgie bearing point 7 0 and there will be impa e'd rections. v

In the o erations of the invention it has been descri ed as a sound reproducer, and it is evident that when sound waves are transmitted to the diaphragms of the device that the stylus thereof can function as recorder.

' It must. be understood that the invention as described and shown is only illustrativm thereof and is not to be considered limitative as various nuddifications may be made thereof without departing from its'spirit.

. Having described my invention what. I, T

. desire to secure by Letters Patent and claim is: i 1

1. In a device of the character described,

the combination of a pair of sound boxes, a

4 diaphragm forfeach sound box, a st lus supporting. bracket coacting with he diaphragn'is, a stylus for the said supporting bracket, the latter .when co'acting with a vertical out record vibrating 'both diaphragms in the same direction and when coacting with a lateral cut record-vibrating the diaphragms in opposite directions.

2. In a device of the character described the combination or a pair of sound boxes, a

diaphragm for each sound box, a single stylussupporting bracket for bothd1'a phragms and connected thereto and mounted to oscillate about-axes at right angles to each other and tensioned by its connection with the diaphragms and a stylus for said sup porting bracket. 7

c 3. In a device of the character described the combination of a pair of sound boxes, a;

' diaphragm for each soundbox, a sin le s ylus supportingbraclzet for both. diaanda! stylusfor sai 1 :7 v phragms mounted to oscillate about axesat right angles to eachother and tensioned by supporting bracketmoving in planes .at

right angles the diaphragins, both when said stylus is ;.coactingfwith a vertical cut record and alsowhencoacting'with a lateral cut record.

the combination of a pair olfsound boxes, a diaphragm tor-each sound box and in the same plane, a supporting and oscillating.

plate supported}; to oscillate in a plane at right anglesto the plane of the diaphragms, a stylus supporting .braohet' adapted to oscillate on said plate with its axis of oscillation at right anglesto-the axis of oscilla- 5. in a deviee"'oi-thecharacter described tion of said plate, said supporting bracket connected to said diaphragms and tensionedby its coaction therewith, a stylus extending from said bracket, said bracket moving 111 planes at right angles to the djaphragms when said stylus is coaoting with a vertical cutrecord and also when coacting with a lateral'cut record. i

Signed at the borough of Manhatt'an, city of New York, in the county of New York and State of New York, this 1stv day of @ctober- A. D. 1921b 1 ANDRE MUD- 'lti hill 

